A method for using an electronic apparatus includes activating a timer function with respect to a certain button if an input by the button is detected for at least a predetermined time, measuring an input hold time with respect to the button from a time point at which the input by the button is started when the timer function is activated, setting a countdown time corresponding to the input hold time with respect to the button, performing a countdown for the set countdown time when the input by the button ends, and performing a function corresponding to the button when the countdown is completed.